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Thousands of American athletes, bodybuilders and amateur sports enthusiasts were sitting in nervous, if pumped, anticipation this week, as US federal investigators announced they had cracked a huge global racket supplying black-market anabolic steroids, human growth hormone and insulin growth factor.

The evidence they seized includes emails and invoices which could implicate customers, some of whom may be leading athletes.

Nationwide raids on 24 September by officials from the US Drug Enforcement Administration led to 124 arrests at 56 steroid labs. Agents seized 242 kilograms of raw steroid powder, mainly of Chinese origin, and 11.4 million doses of steroids.

With…

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